# IN/OUT keywords?

**URL:** <https://forum.kirupa.com/t/in-out-keywords/216788>\
**Category:** programming\
**Created:** [February 20, 2007, 4:45pm UTC](https://forum.kirupa.com/t/in-out-keywords/216788 "2007-02-20T16:45:37Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Al6200](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@Al6200](https://forum.kirupa.com/u/Al6200)\
**Post date:** [February 20, 2007, 4:45pm UTC](https://forum.kirupa.com/t/in-out-keywords/216788/1 "2007-02-20T16:45:37Z")

</div>

In the context of:

int xyz(IN int arg1, IN int arg2, OUT int arg3) {  
return 42;  
}

I have no idea what these keywords mean, and I’m having trouble researching it since its pretty hard to search for “IN”.

As a side questions, should void as the type of a function be capitals or not. Being a Flash/C# programmer at soul, Void looks best to me. But i know not…